Answer Happy

Seet Tim 201 Question 7 (Storage Reliability and Performance) A hard disk drive has the specifications of 2.5" SATA 15 K rpm with block size 4 KB, average access time of 2.9 ms for reads and 3.3 ms for writes, average rotational latency of 2.0 ms, and sustained transfer rate in the range between 151 MB/s and 202 MB/s. (a) Compute average IO processing time for small block IO operations for i. reads with minimum transfer rate ii. reads with maximum transfer rate iii, writes with minimum transfer rate iv, writes with maximum transfer rate v. maximum throughput [10 marks] [6 marks] (b) Compare and contrast between SATA, SAS and SSD type hard disks. A 256 GB SSD disk is rated for 3000 rewriting cycles. This drive is used in a system with 40 GB of read and write actions per day typically. (c) Calculate the average life span of the SSD drive and its usability in a company database server. [4 marks] 36.* years